Every single one of the presidents of the United States have made
their own unique impression on the history of this nation. The most
likely reason that historians choose Abraham Lincoln as our greatest
president is because he helped to keep our nation from completely falling
apart during the Civil War. This was a very hard time to be president as
people were taking sides against each other in the North and South.
Lincoln was a very strong president as you will find out by reading
a little more about him here.